Air brake



D. BERGER.

AIR BRAKE.

APPLICATION FILED NOV 13. 1920.

Patented Aug. 29, 1922.

3 SHEETS-SHEET 1- h ATTORNEYS.

D. BERGER.

AIR BRAKE. APPLICATION men NOVB 13, 1920.

Patented Aug. 29, 1922.

3 SHEETS-SHEET 2.

DellnaBerger M MW D: BERGER.

AIR BRAKE.

APPLICATION FILED NOV=13, 1920. 1 $127,715, Patented Aug. 29, 1922.

3 SHEEISSHEET 3- IN VEN TOR.

Denna Egan" A4) A TTORNEYS.

UNITED STATES PATENT orrica.

Am BRAKE.

Specification of Letters Patent. Pate t d Afi 29 1922 Application filed November 13, Serial 176.4%,957.

T 0 all whom it may cm'iccm Be it known that '1, DELLN o BERGER, a citizen of the United States, residing at Madison Township, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Air Brakes, of which the following is a specification.

The loading of the several cars in an ordinary train of cars often varies so that some are light and others heavy. The brak ing friction necessary toiretard and stop a lightly loaded car is obviously not so great as that required to retard a heavily loaded one. One object of the present invention is the provision of improved means to regulate thebraking pressure for each car tocorrespond with the loading so as to secure upon each car and throughout the train a brakingeffect that is nearly uniform. A further object of the invention is to provide means for automatically supplyiny additional brake pressure, as wherethe ordinary service pressure is insufficient to satisfactorily or promptly retard and stop the motion of the train, said means also embodying devices whereby if the brakes be so firmly applied as to chock the wheels the brakes are automatically released sufli ciently to, permit resumption of the turning. Other objects will appear from the disclosure herein. I

The invention is embodied in the example herein shown and described, the novel fea tures being pointed, out in the claims.

1n the accompanying drawings Figure 1 is a diagrammatic view illustrating the air control system.

Fig. 2 is, a sectional view on a largerscale of the mechanism for primarily admitting the supply ofpressure to the brake cylinder. Fig. 3 is a section on the line 1115-111 Fig. 2, looking to the left. {I

Fig. 1 is a section on the line IV-IV Fig. 2 looking to the left. i

Fig. his a front view of the device for determining and fixing the pressure that shall be delivered to the brake cylinder.

.Fig. 6 is a side view of. the same. Fig.7 is a front view of the means for holding the pressure determining rod from oscillation when the rod is not set--as for eXa-inple when the car is emptyor of normal weight.

Fig.v 8 is a side view of the same.'v I Fig. 9 is a diagrammat c View showing the brakes applied,

the parts illustrated in Figs. 4, 5, 6 and '7 in their relation to each other on a car and also showingthe means whereby the rod for determining the pressure to be delivered to the brake cylinder is automatisettin g.

Fig. 10 is a sectional view of the governor tor controlling according to speed the admission or air to the brake cylinder.

I, F 11 is a side view showing how the automatic governor is normally held out of operative position when running wit-h the brakes released.

Fig. 12 is a similar view showing the governor lowered to operating position and cally moved by the load to its position for In the several views 11 designates the brake cylinder and 12 the rod of the piston 12 therein by which rod the brakes may be operated inthe usual manner through the usual or any approved rigging. 13 designates a pipe for receiving pressure from the, usual auxiliary reservoir 13 through. the usualv triple valve 13. pipe 13 is connected with one end of a chamber 1 1 that in turn isconnected by a pipe 15 with another chamber 16, the latter in turn being a part of or communicating as by pipe 17 with the brake cylinder. 1n the chamber 14- is a piston-like valve 18 supported in the bore of a spider 19, said The valve 18 at the proper time'sea'ting on a pipe 25 with the chamber 1 1, and in said chamber 16 is a poppet release valve 26 pressed by a spring 27 having a predetermined or regulated pressure. 2 V

28 designates a rod supported in suitable brackets alongside the car so as to be movable longitudinally. Between the piston 24 and one end of said rod 28 is avspring 29 so that if the rod be moved toward the piston and held the resistance to outward movement of the piston is increased, such resistance being proportional to the distance therod is so moved and set. Within the chamber leis pivoted a damper 30 having its stem 31 provided externally o'fthe chainher with crank arm 32 actuated by a finger 33 secured on the rod 28. The position of the rod 28 determines the position of the damper so that the greater the-pressure of gaging that rack. The .arm of the sector lever 35 works over an arcuate strip 36 on the side of the car said strip being provided with a series of holes, as indicated, either of which is adapted to receive a pin or other suitable locking device passed through it and a coinciding hole in the sector lever to lock the lever in the position to which it is moved by the shifted rod. The rod 28 has a second toothed sleeve 37 adjustably secured on the rod by means of a set screw 38. The toothed sleeve is normally engaged by the toothed arm of a lever 39 hung below the rod 28 in a suitable bracket 40 on the car, the other arm of said lever being weighted to hold the toothed end up in engaged position. Pivotally hung on the bracket 40 is an arm 41 provided with a finger 41", the lower end of said arm 41 having a pin and slot connection with the piston rod 12 so that when said rod 12 is moved to set the brakes the finger is raised to lift the weighted end of the lever 39 and release its toothed arm from engagement with the toothed sleeve 37. The lever 39 is v designed to keep the rod 28 from reciprocating if desired so as to prevent wear when truck near the spring 29 is a bell crank lever 44 having its upper arm connected by a link rod 45 with the spring 29 while the lower arm of said lever is connected by I cans i .of a link rod 46 with a suitable bracket on the car. The loading of the car, therefore, depresses the rod 46 and moves the rod 28 to compress the springs 29 and When the car is completely loaded and the rod is thus moved the sector lever 35 is swung to a new position and is there locked thus establishing the proper resistance to the piston 24.

The means ,for automatically admitting emergency pressure includes a supporting frame consisting of a shaft 47 upon which are secured a pair of arms 48 provided with hearings in which turns a centrifugal element. Said centrifugal element includes a rotary spool 49 the outer head 49 of which constitutes a friction member to be rotated by a contact wheel 50 (shown in broken lines Fig. 10) fixed on the axle of one of the pairs of the car wheels and to rotate therewith. The other head of said spool has secured to it the ends of the resilient strips 51 carrying the centrifugally actuated weights 52. Said spool 49 fits onits bearing so as to be held from lateral movement. In the hearing of the other arm 48 is 'a spool 53 having an elongated shank and to the inner head of said spool are secured the opposite ends of the flexible strips 51 while the outer head forms a friction member 53 rotated by a contact wheel 54 (shown in broken lines Fig. 10) fixed on the same wheel axle before referred to and to be rotated thereby. The elongated shank of the spool 53 permits it to be reciprocated by the outward and in ward movement of the centrifugal weights and the width of the contact or drive wheel 54 normally insures continuity of rotation of said spool notwithstanding its change of plane due to the lateral movement effected by the centrifugal element. The spools referred to have axial bores through which extends a rod 55 having valves 56 and 5'? at its opposite ends to work across ports 58 and 59 respectively in casings 60 and 61 respectively, said rod being connected with spool 53 to be moved longitudinally thereby. Said valves are constructed to confine the passage of pressure to the pipes when opened.

The valve casing 60 is put in a line of pipe 62 leading from a point of the triple valve to conduct pressure to chamber 16 upon an emergency application. Said pipe has a branch 62 leading through the casing 61. The continuation of the branch 62 beyond said casing 61 contains an ordinary pressure retaining valve 61*.

The bar 47 of the frame 48-48 carrying the centrifugal element is provided with an arm 48 actuated-by a stop 63 on any suitable rod 64 of the brake rigging to hold the heads 49 and 53 removed from the wheels 50 and 54 when the brakes are released, said stop being moved when the brake rigging is moved upon an ordinary service appli cation of the brake to permit the heads 49' and 53 to contact with and be rotated by the members 50 and 54 to whirl the centrifugal element and thereby open the'port of casing 60 and close that of 61.

The operation is as follows: An ordinary service application of the engineers valve releases pressure to the pipe 13 and chamber 16 thereby moving the piston 12 and setting the brakes. In this operation the valve 18 is closed on its seat when the predetermined pressure is reached on piston cation the heads 49 and 53 are dropped into contact With Wheels and 5% thereby opening port of casing 60 and closing that of 61 as beforestated. If on such application the brakes do not operate with sulficient eiiect, or it a quick stop is desired, more pressure is admitted to chamber 16 by an operation of the engineers valve to emergency position. This additional pressure passes through the pipe 62 and valve casing 60 to chamber 16. If in this operation the brake shoes chock the Wheels the operation of the centrifugal element ceases thereby closing port of casing 60 and opening the port of casing 61 thus permitting a limited escape of pressure from the chamber 16 and a resumption of the operation. of the centrifugal element. In this manner a nice regulation of the pressure in the chamber 16 and of the brake shoes is automatically maintained.

The invention is applicable to any air brake system Where pressure can be supplied to the elements described.

Modification can be made in the forms of the parts Without departing from the gist of the invention as claimed. a

What Iclaim is:

1. In an air brake means for predetermining and fixing the amount of braking pressure to be applied including in combi.. nation a chamber communicating With the brake cylinder, means in said chamber 'actuated by the pressure admitted, a valve for cutting off the pressure admitted actuated by said means, adjustable yielding means 2. In an air brake for a car, a conductor for air pressure between a reservoir and the brake cylinder, and a conductor for the release of pressure from the brake cylinder provided With a retaining valve, a governor actuated by the motion of the car Wheels for holding the first named conductor in open condition and the second named conductor closed. I

3. In an air brake for a car, an equipment for an ordinary service application of the brakes, an emergency equipment including means actuated by the motion of the car Wheels for permitting the admission of augmenting pressure to the brake cylinder, and

means for automatically releasing pressure from the brake cylinder upon the cessation of motion of the Wheels.

at. In an air brake for a car, an equipment for an ordinary service application of the brakes, an emergency equipment for permitting the admission of an augmenting pressure to the brake cylinder, and a governor actuated by the motion of the car Wheel for automatically controlling said augmenting supply of pressure.

5. In an air brake for a car, an equipment for an ordinary service application of the brakes, an emergency equipment for permitting the admission of an augmenting pressure to the brake cylinder, a governor actuated by the motion of the car Wheels for automatically controlling said augmenting supply of pressure and means also actuated by said governor for preventing an excess of the augmenting supply of pressure.

6. In an air brake for a car, the combination of a conductor for air pressure between a pressure reservoir and the brake cylinder, and a conductor for the release of pressure from the brake cylinder, a governor actuated by the motion of the car Wheels for holding the first named conductor in open position, and means actuated by the brake piston for holding said governor out of operative position when the brakes are not set.

DELLNO BERGER. 

